There is currently no way to configure WDT to do anything but a system reset

[bjoernQ]

While we can set an interrupt handler, we currently have no way for the user to configure the WDT to cause anything but a system reset.

[playfulFence]

From the current state of #2330

Even though I'm setting everything correctly (I'm also checking if wdt_stgX registers are in correct value), WDT constantly only resets the whole system, no matter which value is in those registers, it never fires an interrupt or if "No Action" mode is set - it still resets the whole system.

I decided to check if that works in IDF implementation and got this result:

code (modified test_reset_reason unit test) :

static void do_rtc_wdt(void)
{
    setup_values();
    // Enable RTC watchdog for 0.1 second
    wdt_hal_context_t rtc_wdt_ctx;
    wdt_hal_init(&rtc_wdt_ctx, WDT_RWDT, 0, false);
    uint32_t stage_timeout_ticks = rtc_clk_slow_freq_get_hz() / 10;
    wdt_hal_write_protect_disable(&rtc_wdt_ctx);
    wdt_hal_config_stage(&rtc_wdt_ctx, WDT_STAGE0, stage_timeout_ticks, WDT_STAGE_ACTION_OFF);
    wdt_hal_config_stage(&rtc_wdt_ctx, WDT_STAGE1, stage_timeout_ticks, WDT_STAGE_ACTION_OFF);
    wdt_hal_config_stage(&rtc_wdt_ctx, WDT_STAGE2, stage_timeout_ticks, WDT_STAGE_ACTION_OFF);
    wdt_hal_config_stage(&rtc_wdt_ctx, WDT_STAGE3, stage_timeout_ticks, WDT_STAGE_ACTION_OFF);

    wdt_hal_set_flashboot_en(&rtc_wdt_ctx, true);
    wdt_hal_write_protect_enable(&rtc_wdt_ctx);
    while (1);
}

Output:

so as you can see even though stage registers are set to Off value, it still resets the whole system

UPD: My bad, for RWDT we needed to turn off flashboot and after some smaller fixes it works in our driver now. However, MWDT still seems to be not working correctly 🤔